US5663432A - Process for the preparation of 5-amino-2,4,6-Triiodoisophthalic acid dichloride by chlorination with thionyl chloride in the presence of a catalyst - Google Patents
Process for the preparation of 5-amino-2,4,6-Triiodoisophthalic acid dichloride by chlorination with thionyl chloride in the presence of a catalyst Download PDFInfo
- Publication number
- US5663432A US5663432A US08/649,490 US64949096A US5663432A US 5663432 A US5663432 A US 5663432A US 64949096 A US64949096 A US 64949096A US 5663432 A US5663432 A US 5663432A
- Authority
- US
- United States
- Prior art keywords
- amino
- triiodoisophthalic acid
- sub
- thionyl chloride
- preparation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- FYSNRJHAOHDILO-UHFFFAOYSA-N thionyl chloride Chemical compound ClS(Cl)=O FYSNRJHAOHDILO-UHFFFAOYSA-N 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 31
- FBJVWRITWDYUAC-UHFFFAOYSA-N 5-amino-2,4,6-triiodobenzene-1,3-dicarbonyl chloride Chemical compound NC1=C(I)C(C(Cl)=O)=C(I)C(C(Cl)=O)=C1I FBJVWRITWDYUAC-UHFFFAOYSA-N 0.000 title claims abstract description 24
- 238000002360 preparation method Methods 0.000 title claims abstract description 16
- 238000005660 chlorination reaction Methods 0.000 title abstract description 7
- 239000003054 catalyst Substances 0.000 title description 7
- JEZJSNULLBSYHV-UHFFFAOYSA-N 5-amino-2,4,6-triiodobenzene-1,3-dicarboxylic acid Chemical compound NC1=C(I)C(C(O)=O)=C(I)C(C(O)=O)=C1I JEZJSNULLBSYHV-UHFFFAOYSA-N 0.000 claims abstract description 18
- 150000005621 tetraalkylammonium salts Chemical class 0.000 claims abstract description 17
- 239000002904 solvent Substances 0.000 claims abstract description 10
- AFVFQIVMOAPDHO-UHFFFAOYSA-N Methanesulfonic acid Chemical group CS(O)(=O)=O AFVFQIVMOAPDHO-UHFFFAOYSA-N 0.000 claims abstract description 9
- 230000003197 catalytic effect Effects 0.000 claims abstract description 9
- JOXIMZWYDAKGHI-UHFFFAOYSA-N toluene-4-sulfonic acid Chemical group CC1=CC=C(S(O)(=O)=O)C=C1 JOXIMZWYDAKGHI-UHFFFAOYSA-N 0.000 claims abstract description 8
- 125000004432 carbon atom Chemical group C* 0.000 claims abstract description 7
- 125000003837 (C1-C20) alkyl group Chemical group 0.000 claims abstract description 6
- 229910052736 halogen Inorganic materials 0.000 claims abstract description 4
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 claims description 47
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical group CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 claims description 15
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 claims description 12
- 239000000203 mixture Substances 0.000 claims description 10
- XKBGEWXEAPTVCK-UHFFFAOYSA-M methyltrioctylammonium chloride Chemical compound [Cl-].CCCCCCCC[N+](C)(CCCCCCCC)CCCCCCCC XKBGEWXEAPTVCK-UHFFFAOYSA-M 0.000 claims description 6
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 claims description 4
- WSLDOOZREJYCGB-UHFFFAOYSA-N 1,2-Dichloroethane Chemical compound ClCCCl WSLDOOZREJYCGB-UHFFFAOYSA-N 0.000 claims description 3
- 150000002367 halogens Chemical group 0.000 claims description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 claims description 2
- CPELXLSAUQHCOX-UHFFFAOYSA-M Bromide Chemical compound [Br-] CPELXLSAUQHCOX-UHFFFAOYSA-M 0.000 claims description 2
- WKBOTKDWSSQWDR-UHFFFAOYSA-N Bromine atom Chemical group [Br] WKBOTKDWSSQWDR-UHFFFAOYSA-N 0.000 claims description 2
- AMDBBAQNWSUWGN-UHFFFAOYSA-N Ioversol Chemical compound OCCN(C(=O)CO)C1=C(I)C(C(=O)NCC(O)CO)=C(I)C(C(=O)NCC(O)CO)=C1I AMDBBAQNWSUWGN-UHFFFAOYSA-N 0.000 claims description 2
- 235000019270 ammonium chloride Nutrition 0.000 claims description 2
- GDTBXPJZTBHREO-UHFFFAOYSA-N bromine Chemical group BrBr GDTBXPJZTBHREO-UHFFFAOYSA-N 0.000 claims description 2
- 229910052794 bromium Inorganic materials 0.000 claims description 2
- 229910052801 chlorine Inorganic materials 0.000 claims description 2
- 239000000460 chlorine Substances 0.000 claims description 2
- 125000001309 chloro group Chemical group Cl* 0.000 claims description 2
- OGQYPPBGSLZBEG-UHFFFAOYSA-N dimethyl(dioctadecyl)azanium Chemical compound CCCCCCCCCCCCCCCCCC[N+](C)(C)CCCCCCCCCCCCCCCCCC OGQYPPBGSLZBEG-UHFFFAOYSA-N 0.000 claims description 2
- 229960001025 iohexol Drugs 0.000 claims description 2
- NTHXOOBQLCIOLC-UHFFFAOYSA-N iohexol Chemical compound OCC(O)CN(C(=O)C)C1=C(I)C(C(=O)NCC(O)CO)=C(I)C(C(=O)NCC(O)CO)=C1I NTHXOOBQLCIOLC-UHFFFAOYSA-N 0.000 claims description 2
- 229960004647 iopamidol Drugs 0.000 claims description 2
- XQZXYNRDCRIARQ-LURJTMIESA-N iopamidol Chemical compound C[C@H](O)C(=O)NC1=C(I)C(C(=O)NC(CO)CO)=C(I)C(C(=O)NC(CO)CO)=C1I XQZXYNRDCRIARQ-LURJTMIESA-N 0.000 claims description 2
- 229960004537 ioversol Drugs 0.000 claims description 2
- ZUZLIXGTXQBUDC-UHFFFAOYSA-N methyltrioctylammonium Chemical compound CCCCCCCC[N+](C)(CCCCCCCC)CCCCCCCC ZUZLIXGTXQBUDC-UHFFFAOYSA-N 0.000 claims description 2
- SBHRWOBHKASWGU-UHFFFAOYSA-M tridodecyl(methyl)azanium;chloride Chemical compound [Cl-].CCCCCCCCCCCC[N+](C)(CCCCCCCCCCCC)CCCCCCCCCCCC SBHRWOBHKASWGU-UHFFFAOYSA-M 0.000 claims description 2
- OUYIGKJMENMQGS-UHFFFAOYSA-N 4-amino-2,4,6-triiodocyclohexa-1,5-diene-1,3-dicarbonyl chloride Chemical compound NC1(I)C=C(I)C(C(Cl)=O)=C(I)C1C(Cl)=O OUYIGKJMENMQGS-UHFFFAOYSA-N 0.000 claims 1
- QTBSBXVTEAMEQO-UHFFFAOYSA-M Acetate Chemical compound CC([O-])=O QTBSBXVTEAMEQO-UHFFFAOYSA-M 0.000 claims 1
- 125000003944 tolyl group Chemical group 0.000 claims 1
- 238000006243 chemical reaction Methods 0.000 abstract description 16
- 238000003786 synthesis reaction Methods 0.000 abstract description 9
- 230000015572 biosynthetic process Effects 0.000 abstract description 8
- 239000000193 iodinated contrast media Substances 0.000 abstract description 4
- 125000005843 halogen group Chemical group 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 10
- 239000011541 reaction mixture Substances 0.000 description 8
- 238000010992 reflux Methods 0.000 description 7
- 238000003756 stirring Methods 0.000 description 7
- HTZCNXWZYVXIMZ-UHFFFAOYSA-M benzyl(triethyl)azanium;chloride Chemical compound [Cl-].CC[N+](CC)(CC)CC1=CC=CC=C1 HTZCNXWZYVXIMZ-UHFFFAOYSA-M 0.000 description 6
- 150000001875 compounds Chemical class 0.000 description 5
- 239000000047 product Substances 0.000 description 5
- SMWDFEZZVXVKRB-UHFFFAOYSA-N Quinoline Chemical compound N1=CC=CC2=CC=CC=C21 SMWDFEZZVXVKRB-UHFFFAOYSA-N 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- 238000002955 isolation Methods 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 description 3
- 238000010533 azeotropic distillation Methods 0.000 description 3
- 238000010626 work up procedure Methods 0.000 description 3
- 239000002253 acid Substances 0.000 description 2
- 239000006227 byproduct Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- KWIUHFFTVRNATP-UHFFFAOYSA-N glycine betaine Chemical compound C[N+](C)(C)CC([O-])=O KWIUHFFTVRNATP-UHFFFAOYSA-N 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 150000003512 tertiary amines Chemical class 0.000 description 2
- TZEBLZRSPJJCOS-UHFFFAOYSA-N 2,4,6-triiodo-5-(methylamino)benzene-1,3-dicarbonyl chloride Chemical compound CNC1=C(I)C(C(Cl)=O)=C(I)C(C(Cl)=O)=C1I TZEBLZRSPJJCOS-UHFFFAOYSA-N 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 150000001348 alkyl chlorides Chemical class 0.000 description 1
- 229960003237 betaine Drugs 0.000 description 1
- 150000001649 bromium compounds Chemical class 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 150000001805 chlorine compounds Chemical class 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000004128 high performance liquid chromatography Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- JMMWKPVZQRWMSS-UHFFFAOYSA-N isopropanol acetate Natural products CC(C)OC(C)=O JMMWKPVZQRWMSS-UHFFFAOYSA-N 0.000 description 1
- 229940011051 isopropyl acetate Drugs 0.000 description 1
- GWYFCOCPABKNJV-UHFFFAOYSA-M isovalerate Chemical compound CC(C)CC([O-])=O GWYFCOCPABKNJV-UHFFFAOYSA-M 0.000 description 1
- 125000000325 methylidene group Chemical group [H]C([H])=* 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 125000001453 quaternary ammonium group Chemical group 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 125000005490 tosylate group Chemical group 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C227/00—Preparation of compounds containing amino and carboxyl groups bound to the same carbon skeleton
- C07C227/14—Preparation of compounds containing amino and carboxyl groups bound to the same carbon skeleton from compounds containing already amino and carboxyl groups or derivatives thereof
- C07C227/18—Preparation of compounds containing amino and carboxyl groups bound to the same carbon skeleton from compounds containing already amino and carboxyl groups or derivatives thereof by reactions involving amino or carboxyl groups, e.g. hydrolysis of esters or amides, by formation of halides, salts or esters
Definitions
- the present invention relates to a process for the preparation of an intermediate useful in the synthesis of organic compounds and, more particularly, it relates to a process for the preparation of 5-amino-2,4,6-triiodoisophthalic acid dichloride.
- 5-Amino-2,4,6-triiodoisophthalic acid dichloride is a known compound useful for the preparation of iodinated contrast media among which we can cite Iopamidol (British patent no. 1,472,050--Savac AG), Iohexol (U.S. Pat. No. 4,250,113--Nyegaard & Co.) and Ioversol (European patent application no. 0 083 964--Mallinckrodt Inc.).
- R 1 , R 2 , R 3 and R 4 are C 1 -C 20 alkyl groups so that the total number of carbon atoms of the groups R 1 , R 2 , R 3 and R 4 is higher than 16;
- object of the present invention is a process for the preparation of 5-amino-2,4,6-triiodoisophthalic acid dichloride by chlorination of 5-amino-2,4,6-triiodoisophthalic acid with thionyl chloride in the presence of a suitable solvent characterized in that the reaction is carried out in the presence of catalytic amounts of a tetraalkylammonium salt of formula
- R 1 , R 2 , R 3 and R 4 are C 1 -C 20 alkyl groups so that the total number of carbon atoms of the groups R 1 , R 2 , R 3 and R 4 is higher than 16.
- the 5-amino-2,4,6-triiodoisophthalic acid dichloride obtained according to the process object of the present invention is useful as intermediate in the synthesis of iodinated contrast media.
- the amount of thionyl chloride used in the process object of the present invention is generally between 2 and 6 moles with respect to 5-amino-2,4,6-triiodoisophthalic acid.
- thionyl chloride for mole of 5-amino-2,4,6-triiodoisophthalic acid are used.
- tetraalkylammonium salt of formula I a molar amount from 0.3 to 10% with respect to 5-amino-2,4,6-triiodoisophthalic acid is intended.
- a molar amount of compound of formula I from 1 to 5% is used.
- the compounds of formula I which can be used in the process object of the present invention are preferably compounds wherein X is chlorine, bromine, mesylate or tosylate; R 1 , R 2 , R 3 , R 4 , the same or different, are C 1 -C 20 alkyl groups so that the total number of carbon atoms is from 25 to 38.
- preferred compounds of formula I are trioctylmethylammonium, methyl-trialkyl(C 8 -C 10 )ammonium, dioctadecyldimethylammonium and tridodecylmethylammonium chlorides, bromides, mesylates or tosylates, which can be optionally prepared in situ from the corresponding tertiary amine and from the suitable alkyl chloride, bromide, mesylate or tosylate.
- trioctylmethylammonium chloride commercialized as Aliquat 336® (registered trademark of Henkel Corporation)
- methyltrialkyl-(C 8 -C 10 )ammonium chloride commercialized as Adogen 446® (registered trademark of Ashland Chemical Co.) are preferably used.
- Suitable solvents are ethyl acetate, toluene, methylene chloride, 1,2-dichloroethane, isopropyl acetate and mixture thereof.
- toluene is used.
- the reaction temperature is not a critical parameter and it can range from 20° C. to the reflux temperature.
- the chlorination process object of the present invention is carried out at warm at a temperature from 60° C. to 90° C.
- a preferred practical embodiment of the present invention is the following.
- a catalytic amount of a tetraalkylammonium salt of formula I is added to a suspension of 5-amino-2,4,6-triiodoisophthalic acid in a suitable solvent.
- the resultant solution is kept at the reaction temperature for some hours.
- the mixture is cooled at room temperature and water is added observing the precipitation of a crystalline product.
- the characterizing feature of the present invention is the presence of a tetraalkylammonium salt as catalyst.
- this kind of catalyst allows to achieve a number of advantages with respect to the prior art, such as extremely high yields and decrease in the amount of thionyl chloride to be used, but mainly a significant decrease of reaction by-products which make difficult the isolation of 5-amino-2,4,6-triiodoisophthalic acid dichloride with a degree of purity suitable for the use as intermediate in the synthesis of iodinated contrast media.
- reaction mixture was kept at 85° C. for 4 hours.
- reaction mixture was kept at 70° C. for 4 hours.
- Adogen 446® 2.5 g; 5.1 mmoles
- reaction mixture was kept at 85° C. for 4 hours.
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)
- Indole Compounds (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ITMI951004A IT1275429B (it) | 1995-05-18 | 1995-05-18 | Processo per la preparazione di un intermedio utile nella sintesi di composti organici |
| ITMI95A1004 | 1995-05-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US5663432A true US5663432A (en) | 1997-09-02 |
Family
ID=11371619
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US08/649,490 Expired - Lifetime US5663432A (en) | 1995-05-18 | 1996-05-17 | Process for the preparation of 5-amino-2,4,6-Triiodoisophthalic acid dichloride by chlorination with thionyl chloride in the presence of a catalyst |
Country Status (20)
| Country | Link |
|---|---|
| US (1) | US5663432A (sv) |
| JP (1) | JP3865405B2 (sv) |
| AU (1) | AU5895096A (sv) |
| BE (1) | BE1009466A3 (sv) |
| CA (1) | CA2221278C (sv) |
| CH (1) | CH691534A5 (sv) |
| CZ (1) | CZ287815B6 (sv) |
| DE (1) | DE19681399B4 (sv) |
| DK (1) | DK176046B1 (sv) |
| FR (1) | FR2734262B1 (sv) |
| GB (1) | GB2315751B (sv) |
| HU (1) | HUP9801142A3 (sv) |
| IE (1) | IE80674B1 (sv) |
| IL (1) | IL118062A (sv) |
| IT (1) | IT1275429B (sv) |
| NL (1) | NL1003127C2 (sv) |
| NO (1) | NO310286B1 (sv) |
| SE (1) | SE520616C2 (sv) |
| WO (1) | WO1996036590A1 (sv) |
| ZA (1) | ZA963788B (sv) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101307010B (zh) * | 2008-07-12 | 2011-05-25 | 厦门大学 | 碘佛醇的合成方法 |
| US10342232B1 (en) | 2018-10-24 | 2019-07-09 | The United States Of America As Represented By The Secretary Of The Navy | Iodinated polymers for biological agent defeat |
| US10508072B2 (en) | 2015-10-02 | 2019-12-17 | Zeon Corporation | Method for producing acid halide solution, mixed solution, and method for producing monoester compound |
| US10633323B2 (en) | 2016-01-26 | 2020-04-28 | Zeon Corporation | Method of producing acid halide solution and method of producing monoester compound |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| PT105770B (pt) * | 2011-06-24 | 2013-07-08 | Hovione Farmaciencia S A | Novo intermediário e seu uso na preparação de agente de contrate triiodado |
| DK2931696T3 (en) | 2012-12-11 | 2018-12-17 | Bracco Imaging Spa | CONTINUOUS PROCEDURE FOR THE PREPARATION OF (S) -2-ACETYLOXYPROPIONIC ACID |
| PT3154928T (pt) | 2014-06-10 | 2020-05-04 | Bracco Imaging Spa | Método para a preparação de ácido (s)-2-acetiloxipropiónico e seus derivados |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR825418A (fr) * | 1936-08-10 | 1938-03-03 | Bosch Robert | Pompe à combustibles liquides |
| US3655752A (en) * | 1969-06-20 | 1972-04-11 | Sterling Drug Inc | Isomers of 2 4 6-trihalo-n n n' n'-tetraalkylisophthalamides |
| GB1472050A (en) * | 1974-12-13 | 1977-04-27 | Savac Ag | Non-ionic x-ray contrast agents |
| US4250113A (en) * | 1976-06-11 | 1981-02-10 | Nyegaard & Co. A/S | Chemical compounds |
| EP0026281B1 (de) * | 1979-08-09 | 1982-12-15 | BRACCO INDUSTRIA CHIMICA Società per Azioni | Neue Derivate der 2,4,6-Trijod-isophthalsäure, Verfahren zu deren Herstellung und diese enthaltende Röntgenkontrastmittel |
| EP0083964A1 (en) * | 1982-01-11 | 1983-07-20 | Mallinckrodt, Inc. (a Delaware corporation) | Compounds suitable for X-ray visualisation methods |
| EP0118347A1 (fr) * | 1983-02-25 | 1984-09-12 | Guerbet S.A. | Composés non-ioniques à structure benzénique iodée ou bromée et produits opacifiants en contenant |
| WO1991009007A2 (en) * | 1989-12-13 | 1991-06-27 | Mallinckrodt, Inc. | Nonionic x-ray contrast agents, compositions and methods |
| WO1993010825A1 (en) * | 1991-12-03 | 1993-06-10 | Mallinckrodt Medical, Inc. | Nonionic x-ray contrast agents, compositions and methods |
| WO1996016927A1 (en) * | 1994-11-29 | 1996-06-06 | Zambon Group S.P.A. | Process for preparing 5-amino-2,4,6-triiodoisophthalic acid dichloride by chlorination of the corresponding acid in the presence of a tertiary amine salt or quarternary ammonium salt |
-
1995
- 1995-05-18 IT ITMI951004A patent/IT1275429B/it active IP Right Grant
-
1996
- 1996-04-29 IL IL11806296A patent/IL118062A/xx not_active IP Right Cessation
- 1996-05-09 FR FR9605773A patent/FR2734262B1/fr not_active Expired - Lifetime
- 1996-05-10 HU HU9801142A patent/HUP9801142A3/hu unknown
- 1996-05-10 DK DK199701303A patent/DK176046B1/da not_active IP Right Cessation
- 1996-05-10 CZ CZ19973633A patent/CZ287815B6/cs not_active IP Right Cessation
- 1996-05-10 CA CA002221278A patent/CA2221278C/en not_active Expired - Lifetime
- 1996-05-10 JP JP53453196A patent/JP3865405B2/ja not_active Expired - Lifetime
- 1996-05-10 WO PCT/EP1996/002009 patent/WO1996036590A1/en active IP Right Grant
- 1996-05-10 GB GB9724181A patent/GB2315751B/en not_active Expired - Lifetime
- 1996-05-10 AU AU58950/96A patent/AU5895096A/en not_active Abandoned
- 1996-05-10 CH CH02665/97A patent/CH691534A5/de not_active IP Right Cessation
- 1996-05-10 DE DE19681399T patent/DE19681399B4/de not_active Expired - Lifetime
- 1996-05-13 ZA ZA963788A patent/ZA963788B/xx unknown
- 1996-05-15 NL NL1003127A patent/NL1003127C2/nl not_active IP Right Cessation
- 1996-05-17 IE IE960350A patent/IE80674B1/en not_active IP Right Cessation
- 1996-05-17 US US08/649,490 patent/US5663432A/en not_active Expired - Lifetime
- 1996-05-20 BE BE9600446A patent/BE1009466A3/fr not_active IP Right Cessation
-
1997
- 1997-11-17 SE SE9704190A patent/SE520616C2/sv unknown
- 1997-11-17 NO NO19975260A patent/NO310286B1/no not_active IP Right Cessation
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR825418A (fr) * | 1936-08-10 | 1938-03-03 | Bosch Robert | Pompe à combustibles liquides |
| US3655752A (en) * | 1969-06-20 | 1972-04-11 | Sterling Drug Inc | Isomers of 2 4 6-trihalo-n n n' n'-tetraalkylisophthalamides |
| GB1472050A (en) * | 1974-12-13 | 1977-04-27 | Savac Ag | Non-ionic x-ray contrast agents |
| US4250113A (en) * | 1976-06-11 | 1981-02-10 | Nyegaard & Co. A/S | Chemical compounds |
| EP0026281B1 (de) * | 1979-08-09 | 1982-12-15 | BRACCO INDUSTRIA CHIMICA Società per Azioni | Neue Derivate der 2,4,6-Trijod-isophthalsäure, Verfahren zu deren Herstellung und diese enthaltende Röntgenkontrastmittel |
| EP0083964A1 (en) * | 1982-01-11 | 1983-07-20 | Mallinckrodt, Inc. (a Delaware corporation) | Compounds suitable for X-ray visualisation methods |
| EP0118347A1 (fr) * | 1983-02-25 | 1984-09-12 | Guerbet S.A. | Composés non-ioniques à structure benzénique iodée ou bromée et produits opacifiants en contenant |
| WO1991009007A2 (en) * | 1989-12-13 | 1991-06-27 | Mallinckrodt, Inc. | Nonionic x-ray contrast agents, compositions and methods |
| WO1993010825A1 (en) * | 1991-12-03 | 1993-06-10 | Mallinckrodt Medical, Inc. | Nonionic x-ray contrast agents, compositions and methods |
| WO1996016927A1 (en) * | 1994-11-29 | 1996-06-06 | Zambon Group S.P.A. | Process for preparing 5-amino-2,4,6-triiodoisophthalic acid dichloride by chlorination of the corresponding acid in the presence of a tertiary amine salt or quarternary ammonium salt |
Non-Patent Citations (2)
| Title |
|---|
| Kenneth A. Burdett, "An Improved Acid Chloride Preparation Via Phase Transfer Catalysis", Syntheses, pp. 441-442, Jun. 1991. |
| Kenneth A. Burdett, An Improved Acid Chloride Preparation Via Phase Transfer Catalysis , Syntheses, pp. 441 442, Jun. 1991. * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101307010B (zh) * | 2008-07-12 | 2011-05-25 | 厦门大学 | 碘佛醇的合成方法 |
| US10508072B2 (en) | 2015-10-02 | 2019-12-17 | Zeon Corporation | Method for producing acid halide solution, mixed solution, and method for producing monoester compound |
| US10633323B2 (en) | 2016-01-26 | 2020-04-28 | Zeon Corporation | Method of producing acid halide solution and method of producing monoester compound |
| US10342232B1 (en) | 2018-10-24 | 2019-07-09 | The United States Of America As Represented By The Secretary Of The Navy | Iodinated polymers for biological agent defeat |
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